用冷原子荧光法测定水中汞时,固定溶液的配制方法是;将0.5g重铬酸钾(优级纯)溶于9 发布时间:2017-06-27 04:25 │ 来源:www.tikuol.com 题型:判断题 问题: 用冷原子荧光法测定水中汞时,固定溶液的配制方法是;将0.5g重铬酸钾(优级纯)溶于950m1水中,加入50m1优级纯浓硫酸。
题型:判断题 When I walk_____ the classroom, all the students are listening carefully. [ ]A. passed B. to pass C. past D. pass 查看答案
题型:判断题 The noise of the traffic makes my head________.How I wish I were not on the road.[ ]A.pain B.hurtC.ache D.wound 查看答案